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Environmental Engineering

Environmental Engineering
The design discharge for the combined sewer system shall be taken as

Rainfall + DWF
Equal to rainfall
Rainfall + 6 DWF
Rainfall + 2 DWF

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Environmental Engineering
The distribution mains are designed for

Average daily demand
Maximum hourly demand
Maximum hourly demand on maximum day
Maximum daily demand

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Environmental Engineering
When there is no recirculation of sewage, then recirculation factor is

Infinity
None of these
1

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Environmental Engineering
The most common cause of acidity in water is

Carbon dioxide
Oxygen
Nitrogen
Hydrogen

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Environmental Engineering
Air binding phenomena in rapid sand filters occur due to

Mud ball formation
Low temperature
Excessive negative head
Higher turbidity in the effluent

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Environmental Engineering
The commonly used material for water supply pipes, which has the properties of being strong, not easily corroded and long life but is heavy and brittle, is

Reinforced cement concrete
Copper
Cast iron
Steel

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